Nicolai de Cusa De beryllo / editionem funditus renovatam atque instauratam curaverunt Iohannes Gerhardus Senger et Carolus Bormann. - Cusanus, Nicolaus, card., 1401-1464. (OLS)http://pul/name/725; Bormann, Karl. (OLS)http://pul/name/13467; Senger, Hans Gerhard. (OLS)http://pul/name/13471 (in aedibus Felicis Meiner, 1988)